Time-resolved Raman scattering measurements are made by using 110 fs laser pulses in germanium at the initial carrier density of 3×{}10¹⁸ cm^-3. Intensity build-up is clearly observed for the Raman scattering due to photoexcited electrons in L valleys and is quantitatively analyzed in terms of the theory on the electronic light scattering from a multicomponent electron gas. We show that photoexcited electrons initially created in the {Γ} valley are scattered into L valleys with a time constant of 1.2±{}0.1 ps.
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Tanaka et al. (1993) studied this question.
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